<template>
  <div>
    <!-- 弹出层的头部区域 -->
    <van-nav-bar title="频道管理">
      <template #right>
        <van-icon name="cross" size="0.37333334rem" color="white" @click="closeFn"/>
      </template>
    </van-nav-bar>
    <!-- 我的频道 -->
    <div class="my-channel-box">
      <div class="channel-title">
        <span>我的频道
          <span class="small-title">
            点击{{ isShowCross ? "删除" : "进入" }}频道
          </span>
        </span>
        <span @click="isShowCross =!isShowCross">{{ isShowCross ? "完成" : "编辑" }}</span>
      </div>
      <!-- 我的频道列表 -->
      <van-row type="flex">
        <van-col
        span="6"
        v-for="(obj, idx) in selectedChannelList"
        :key="obj.id"
        @click="$emit('enter-channel', obj.id)"
        >
          <div class="channel-item van-hairline--surround">
            <span>{{obj.name}}</span>
            <!-- 删除的徽标 -->
            <van-badge
            color="transparent"
            class="cross-badge"
            v-if="isShowCross && obj.id !== 0">

              <template #content>
                <van-icon
                  name="cross"
                  class="badge-icon"
                  color="#cfcfcf"
                  size="0.32rem"
                  @click="$emit('del-channel', idx)"
                />
              </template>
            </van-badge>
          </div>
        </van-col>
      </van-row>
    </div>

    <!-- 更多频道 -->
    <div class="more-channel-box">
      <div class="channel-title">
        <span>点击添加更多频道：</span>
      </div>
      <!-- 更多频道列表 -->
      <van-row type="flex">
        <van-col span="6" v-for="obj in unSelectedChannelList" :key="obj.id"  @click="addFn(obj)">
          <div class="channel-item van-hairline--surround">{{obj.name}}</div>
        </van-col>
      </van-row>
    </div>
  </div>
</template>

<script>
import { getChannelListAPI } from '@/api/home'
export default {
  props: {
    // 已选频道
    selectedChannelList: {
      type: Array,
      required: true
    }
  },
  data () {
    return {
      allChannelList: [], // 所有频道
      isShowCross: false // 控制徽标显示隐藏
    }
  },
  async created () {
    // 请求所有频道
    const res = await getChannelListAPI()
    this.allChannelList = res.data.channels
  },
  computed: {
    unSelectedChannelList () {
      // some/find/find
      // filter: 返回 true 表示该元素通过测试，保留该元素，false 则不保留
      return this.allChannelList.filter(obj => {
        // return !this.selectedChannelList.some(item => item.id === obj.id)
        const flag = this.selectedChannelList.some(item => item.id === obj.id)
        if (flag) {
          return false
        } else {
          return true
        }
      })
    }
  },
  methods: {
    // 关闭弹层，重置编辑状态
    closeFn () {
      this.$emit('close-popup')
      this.isShowCross = false
    },
    addFn (item) {
      if (!this.isShowCross) return
      this.$emit('add-channel', item)
    }
  }
}
</script>

<style scoped lang="less">
.van-popup,
.popup-container {
  background-color: transparent;
  height: 100%;
  width: 100%;
}

.popup-container {
  display: flex;
  flex-direction: column;
}

.pop-header {
  height: 90px;
  background-color: #007bff;
  color: white;
  text-align: center;
  font-size: 14px;
  position: relative;
  .title {
    width: 100%;
    position: absolute;
    bottom: 15px;
  }
}

.pop-body {
  flex: 1;
  overflow: scroll;
  padding: 8px;
  background-color: white;
}

.my-channel-box,
.more-channel-box {
  .channel-title {
    display: flex;
    justify-content: space-between;
    font-size: 14px;
    line-height: 28px;
    padding: 0 6px;
  }
}

.channel-item {
  font-size: 12px;
  text-align: center;
  line-height: 36px;
  background-color: #fafafa;
  margin: 5px;
}

/*删除的微标 */
.cross-badge {
  position: absolute;
  right: -3px;
  top: 0;
  border: none;
}

/*提示文字 */
.small-title {
  font-size: 10px;
  color: gray;
}

</style>
